diff --git a/packages/preset-umi/src/features/ssr/ssr.ts b/packages/preset-umi/src/features/ssr/ssr.ts
index 83f4a0ecb9938..d5381331d165a 100644
--- a/packages/preset-umi/src/features/ssr/ssr.ts
+++ b/packages/preset-umi/src/features/ssr/ssr.ts
@@ -53,10 +53,9 @@ export default (api: IApi) => {
   api.modifyConfig((memo) => {
     // define SSR_BUILD_TARGET to strip useless logic
     memo.define ??= {};
-    memo.define.SSR_BUILD_TARGET =
-      api.config.ssr.serverBuildTarget || 'express';
+    memo.define.SSR_BUILD_TARGET = memo.ssr.serverBuildTarget || 'express';
 
-    if (api.config.serverBuildTarget === 'worker') {
+    if (memo.ssr.serverBuildTarget === 'worker') {
       // use browser version of react-dom/server for worker mode
       // ref: https://github.com/facebook/react/blob/f86afca090b668d8be10b642750844759768d1ad/packages/react-server-dom-webpack/package.json#L52
       memo.alias['react-dom/server$'] = winPath(